change­bar – Gen­er­ate change­bars in LaTeX doc­u­ments

Iden­tify ar­eas of text to be marked with change­bars with the
\cb­start and \cbend com­mands; the bars may be
coloured. The pack­age uses 'drivers' to place the bars; the
avail­able drivers can work with dvi­tol­n03, dvi­tops, dvips, the
emTeX and TeXtures DVI drivers, and VTeX and PDFTeX.